Designed with input from professionals in the special operations community from around the world, the H.R.T. is the most functional and innovative boot on the market. Waterproof Sympatex® lining allows the foot to breathe as well as stay dry, while the Armortex® Kevlar® side panels give the boot stability and support. The carbon based outsole design incorporates the latest technology in slip and oil resistant rubber with minimal squeaking. All of these materials in the H.R.T. boot come together to comprise the 5.11 Shock Mitigation System™. 5.11 Tactical is setting a new and higher standard for tactical footwear.